其主要用途包括矿石加工，化肥生产，石油炼制，废水处理和化学合成。
Principal USES include ore processing, fertilizer manufacturing, oil refining, wastewater processing and chemical synthesis.
此单元组的工人操作单一功能的机器或作为较大的生产过程中的一部分的机械，来处理矿石和金属制品。
Workers in this unit group operate single-function machines or machinery that is part of a larger production process to process mineral ore and metal products.
在不同的处理阶段检查矿石，金属，水泥，玻璃，粘土或水泥产品，以确保遵守规范。
Inspect mineral ore, metal, cement, glass, clay or concrete products at various stages of processing to ensure adherence to specifications.
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